GitHub Actions for Engineers›Building and Testing

Building and Testing

Test matrix, caching dependencies, artifact uploads.

~20 min read

Building and Testing with GitHub Actions

Test matrix

Run tests across multiple Node.js versions:

jobs:
  test:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        node-version: [18, 20, 22]
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}
      - run: npm ci
      - run: npm test

Caching dependencies

- uses: actions/setup-node@v4
  with:
    node-version: 20
    cache: 'npm'  # Automatically caches node_modules

Uploading artifacts

- uses: actions/upload-artifact@v4
  with:
    name: test-results
    path: coverage/
    retention-days: 7

Coverage reports

- name: Upload coverage to Codecov
  uses: codecov/codecov-action@v4
  with:
    token: ${{ secrets.CODECOV_TOKEN }}